Results 41 to 50 of about 2,410 (118)
Dianci bileiqi, 2022 随着复合绝缘子运行数量和时间的增加，并长期承受电场、机械负荷和复杂多变的环境作用，其硅橡胶伞裙的老化问题日益突出，威胁了电网的安全稳定运行。结合笔者的研究成果，从传统和新的老化评估方法两个方面，综述了当前复合绝缘子硅橡胶伞裙的老化评估进展。传统方法包括外观检查、喷水分级法、静态接触角法及红外热像法等。这些方法比较简便、直观，但主要涉及复合绝缘子老化引起的外在表现，无法提出材料老化的量化参数。老化评估新方法包括扫描电子显微镜、热重分析、傅里叶红外光谱以及热刺激电流法等 ...
曾磊磊 +11 more
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Low Switching Frequency Multi-Layered Model Predictive Control Strategy for Three-Phase PWM Rectifier [PDF]
[Objective] With the continuous expansion of the use of DC microgrids in distribution networks, high-power three-phase pulse width modulation (PWM) rectifiers are becoming increasingly important.
Chenyang XIA +6 more
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Effect of Tremella Polysaccharides with Different Molecular Weights on Structure and Physicochemical Properties of Oat Starch(不同分子质量银耳多糖对燕麦淀粉结构与理化性质的影响) [PDF]
Shipin kexue jishu xuebaoTo investigate the effects of polysaccharides from Tremella fuciformis with different molecular weights on the structure and physicochemical properties of oat starch, acidic extracts (ACE, approximately 37.4kDa) and alkali extracts (ALE, approximately ...
SHI Xiaodan(施晓丹) +3 more
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Summary of Desert Photovoltaic Power Transmission Technology [PDF]
To achieve carbon peaking and carbon neutrality goals and improve energy efficiency, new energy plays a major role in China strategic deployment. However, as centralized photovoltaic is located in desert areas, photovoltaic power transmission has become ...
CHU Shuai +5 more
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Grid-Connected Power Fluctuation Suppression and Energy Storage Optimization Configuration of Photovoltaic-Energy Storage System [PDF]
ObjectivesBattery energy storage system is one of the effective means to ensure the reliability of photovoltaic (PV) power generation system and improve the utilization rate of PV power generation.
JIANG Menghao +4 more
core +1 more source
Comprehensive survey on computing-electricity collaboration: architecture, key technologies and prospects [PDF]
With the deepening of the digital economy and the advancement of “dual-carbon” targets, the integration of computing power and electric power, as two critical infrastructure systems, has been recognized as a pivotal paradigm for supporting the ...
FANG Zeru +7 more
core +1 more source
Dianci bileiqi光储微电网是解决偏远地区供电问题的重要手段，有必要做好雷电感应过电压防护以确保系统长期稳定运行。利用PSCAD软件搭建独立光储微电网仿真电路模型，计算微电网内埋地电缆雷电感应过电压，分析感应过电压在系统直流侧和交流侧的传递特性，讨论电缆埋深和电缆长度对过电压幅值的影响，最后分析安装SPD防护效果。研究结果表明：当独立光储微电网直流侧发生雷击时，埋地电缆感应产生较高幅值的过电压，过电压沿线缆传递至光伏阵列和储能系统，交流侧设备不受影响，同样，当交流侧发生雷击时，电缆感应过电压传递至逆变器交流侧和箱变前端 ...
金耀, 许健
doaj
, 2017 根据液压发电系统特性可知，其工作转速由蓄能器压力和发电机负载决定，而蓄能器压力和发电机负载是实时变量，不加控制将无法实现液压发电系统始终工作在最佳转速曲线。特别是当液压发电系统整流后直接馈入海岛直流微电网时，转速由直流电网电压唯一确定。文中通过引入Boost变换电路，实现液压发电系统转速的实时控制。提出最高效率转换控制策略，实现液压发电系统始终工作在最佳转速曲线。推导了液压发电系统Boost变换机理，通过试验得到了最佳转速曲线，建立了液压发电系统经过交错并联Boost变换器馈入直流微电网的仿真模型 ...
叶寅 +4 more
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Gaoya dianqi针对光伏出力的间歇性与不稳定性，使得单纯依赖蓄电池进行能量平抑和调节，难以满足微电网持续稳定运行的需求，提出考虑氢能应用的光伏直流微电网中储能容量配置寻优方法。考虑氢能在光伏直流微电网中的应用，对光伏电池、蓄电池以及电解槽—储氢罐—燃料电池建模分析。根据建模分析结果，设计功率平抑控制策略与混合储能充放电管理策略。将最大化年净利润与光伏自消纳率作为优化目标，建立储能容量配置优化模型，获得储能容量最优配置结果。实验结果表明，应用所提方法后，光伏直流微电网的功率偏移率实现了显著的降低，调峰能力得到了有效优化 ...
林泽源, 王宗尧, 张凡, 王蕊超
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Gaoya dianqi, 2019 随着智能电网、能源互联网等电网技术的快速发展,多端口电力电子变压器成为交直流混合微电网的核心设备。相关理论和技术的研究得到了越来越广泛的关注。但是,从总体而言,多端口电力电子变压器的技术并不成熟,还有很多需要深入研究的地方。文中主要总结了电力电子变压器不同的拓扑和控制算法,提出在不同的应用场合下如何选取合适的拓扑和控制算法。通过分析多端口电力电子变压器发展历史,对多端口电力电子变压器的电路拓扑、成本、效率、可用率以及控制算法等进行了分析和对比。总结在不同应用场合下如何选取合适的系统拓扑和控制算法 ...
庞博, 侯丹, 李天瑞
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